If I understand correctly, this project is the upstream source of man pages that document system calls, special files, libraries functions, and other interfaces in the kernel.
Perhaps the impact will be these pages will no longer be updated as frequently, unless someone takes over?
Instead of being a prick like the other responder I'm going to give you a half informed understanding. Basically nothing. Lots of projects that are used on a daily basis in production have no maintainers. There is a web UI showing the number of Debian packages with no active maintainer.
the part where he says "I'd welcome an offer to sponsor my work here;" indicates a desire to engage in a transaction which exchanges currency units for continued contribution to his existing endeavor.
